Article forming apparatus



Aug. 6, 1946. E. E. BARKSTROM ET Al.

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ARTICLE FORMING APPARATUS Filed Aug. 28, 1945 5 Sheets-Sheet 2 Aug. 6, 1946.

[RT g Aug 6, 1946. E. E. BARKsTRoM ET AL 2,405,485-

ARTIGLE FORMING APPARATUS Filed Aug. 28, 1943 I 5SheetS-Sheet 3 Aug. 6, 1946.? E, E, BARKSTROM ET Al. 2,405,485

ARTICLE FORMING APPARTUS Filed Aug. 28, -1945 5 sheets-sheet 4 Aug. 6, 1946. E. E. BARKSTROM ET Al. 405,485

ARTICLE FORMING APPARATUS F11-ed Aug. 28, 194s v5 sheets-sheet 5 A /43 i f/G; ,744.

Patented Aug. 6, 1946 ARTICLE FORMING APPARATUS Elmer E. Barkstrom, Chicago, and Lorris Williams, Western Springs, Ill., assignors to Western Electric Company, Incorporated, New York, N. Y., a corporation of New York Application August 28, 1943, Serial No. 500,362

This invention relates to article forming apparatus and more particularly to apparatus for forming spiral resistors.

It is an object of the present invention to provide a semi-automatic apparatus of simple construction for expeditiously forming articles.

In accordance with one embodiment of the invention, an apparatus is provided for forming resistors by cutting a spiral groove in a cylindrical member made of ceramic material and having an electrical conducting coating thereon. In this apparatus, the coated cylindrical member is placed in co-axially aligned chucks, one of which is positively driven and the other of which is mounted for free rotation and then, upon the operation of a single manually operable lever, a cycle of operation is initiated which moves a cutting disc or wheel into engagement with the coated cylindrical member and then causes the cutting wheel to travel longitudinally of the cylindrical member, which is simultaneously rotated at a relatively slow rate of speed, whereby the cutting wheel cuts a spiral groove in the cylindrical member. The cutting wheel is thus automatically advanced upon moving it into engagement with the coated cylindrical ceramic member and at the end of its cutting operation, is moved out of engagement with the cylindrical member and into engagement with a reversing screw, which returns the apparatus to its normal starting position, where it is automatically stopped for unloading and reloading of the apparatus.

A complete understanding of the invention may be had by reference to the followingr detailed description when considered in conjunction with the accompanying drawings, wherein Fig. l. is a front elevational View of a preferred form of the apparatus;

Fig. 2 is a horizontal sectional View taken substantially along the line 2-2 of Fig. 1 in the direction of the arrows;

Hg. 3 is a vertical sectonal view taken substantially along the line 3 3 of Fig. 1 in the direction of the arrows and showing the apparatus on a somewhat larger scale than shown in Fig. 1;

Fig. 4 is a rear elevational view of a portion l 10 Claims. (Cl. {l0-11.64)

substantially along the line 6--6 of Fig. 1 in the direction of the arrows;

Fig. '7 is an enlarged view of the article manufactured in the apparatus shown in the other views;

Fig. 8 is a circuit diagram showing the control circuit of the apparatus.

Referring to the drawings, particular reference being iirst had to Fig. 7, wherein the article formed in the apparatus is shown on an enlarged scale, it will be seen that the resistor designated I0 formed in the apparatus comprises a cylindrical member II which may be any suitable ceramic coated with conducting material; for example, particularly a carbon deposit, and having a spiral groove I2 formed in it extending substantially the entire length of the member I I.-

It will be apparent that a resistor of this type may be formed with a high degree of accuracy by causing the current owing through the resistor to travel around the circuitous path formed by the conducting material remaining upon the cylindrical member after the groove has been formed in the cylindrical member and that the resistance of the resistor may thus be controlled with a high degree of accuracy by adjusting the angularity by which the spiral groove is cut in the resistor. Y

As may be seen most clearly by reference to Figs. 1, 2 and 3, the apparatus includes a lathe frame I 3 having Suitable legs or standards III-I4, which may be positioned upon a bench or table I5 at a suitable height to accommodate an operator using the machine. The lathe frame I3 has a bearing I 6 formed adjacent its right end (Fig. l) for rotatably supporting one end of the feed screw I'I, the other end of which extends into a gear box I8, in which suitable gearing may be mounted for transmitting motion from a pulley I9 to a spindle 20 and to the feed screw I1. The pulley I9 is adapted to be driven b v a motor 2| through the belt 22. The spindle 20 is suitably iournalled for rotary and sliding movement in a bearing 23 formed on the gear box I 8 and in a bearing bracket 24. The spindle 20 carries a chuck 25, as seen most clearly in Figs. l, 2 and 6, which may be of any suitable construction as long as it includes a pair of chuck jaws fifi-2.5i adapted to be clamped onto a resistor IB when the spindle 20 is moved to the left due to the engagement of cam faces 2'I-2I on the chuck jaws with cooperating cam faces 28-28 on a collar 29, which is fixed against slidable movement with respect to the bearing bracket 24, but which rotates with the spindle 2B. The left end of the spindle 20 has a collar 3|] threaded on it or otherwise suitably attached to it and between the collar 3U and the left of the bearing 23 a compression spring 3| is positioned around the spindle 2|), whereby the spindle 20 is always urged to the left (Figs. l and 2) thus to urge the chuck jaws 26 to the left, where they will be cammed down into engagement with a resistor I3 to be grooved in the apparatus.

Mounted in axial alignment with the chuck 25 is a second resistor holding chuck 35, as seen most clearly in Fig. 6. This chuck comprises a spindle 36 having a shouldered portion 31 in which a resistor-holding tool 38 may be xed by means of a set screw 33. The resistor holdingY tool 33. has a centrally positioned tapered aperture 4I), in which the right end (Fig. 6) of a resistorV may seat itself when the chucks 35 and 25 are in the position shown in Fig. 6. It will be understood that the tool 3B does not clamp the resistor I@ except insofar as the resistor II] is pushed into the tapered aperture 40. The right end ofthe spindle 35 (Fig. 6) has a collar 4I fastened to it which cooperates with offset portions of the spindle to hold a pair of bearing races 42-42 in place on the spindle. The bearing races 42 cooperate with outer races 43-43 to rotatably support the spindle 35 in a sleeve 44 and the outer races 43 are clamped in the sleeve 44 by means of a spacer 45 and threaded collar 4S. The sleeve 44 i5 slidably mounted in a cylinder 41, having an internal shoulder 48 towards which the sleeve 44 is normally urged by a compression spring 49 interposed between a threaded plug 523 threaded into the right end (Fig. 6) of the cylinder 41 and a disc engaging the pin 52 which extends through the sleeve 44 and cylinder 41. The pin 52 is xed to the sleeve 44 and is slidable in anaperture 53 in the cylinder 41. The cylinder 41 is mounted upon a tail stock bracket 54, which extends upwardly from a tail stock 55, suitably mounted upon the lathe frame I3.

Mounted upon the bracket 54I of the tail stock adjacent its right end (Fig. 2) is a block E5, carrying a pivot pin 6,6 (Figs. 2 and 5) on which there is, in turn, pivoted a bell crank lever E1. The bell crank 61 has links 68 and 89 connected to it and the link 58 is, in turn, pivotally connected, as shown most clearly in Fig. 3, to an enlarged portion of the pin 52, which serves to actuate the sleeve 44. The link 65 is slidable in a bearing 1S (Figs. 2 and 5) mounted upon aV bearing plate 1|, which isin turn, attached to the lathe frame I3 by means of a block 12 and a. machine screw 13. The bearing plate 1I, in addition to. supporting the bearing 10, supports a bearing 14, in which there is rotatably mounted a shaft 15. One end of the shaft has a control lever. 16 fixed to it. The other end of the shaft 15 has a lever. 11 iixed to it, the purpose of which will be described hereinaftenand intermediate the bearing 14 and lever 11 the shaft 15 carries a cam 18. The control lever 16 has a camming block 19 `suitably attached toit in position to engage the link 69 and through the link 69 rock the bell crank |31` in a counterclockwise direction (Fig. 2) for moving the link 68 to the right and releasing the resistor holding tool 38 from a resistor which has been grooved the apparatus.

The lever 11 has a link 80 attached to it, which extends substantially the entire length of the apparatus, as shown in Fig. 2.` At its left en as viewed in Figs. l and 2, the link 80 has a lock nut assembly 8| threaded onto it to the left of a lever 82, which is suitably apertured to permit the 4 link Sii to pass through it freely. The lever 82 is pivotally mounted on a bracket B3, which is, in turn, supported by the gear box I8. Intermediate its ends, the lever 82 has a threaded member 84 locked in it by means of a lock nut 85. The threaded member 85 is adapted to engage the collar 35 and move the spindle 2Q to the right when the link 86 is moved to the right by control lever 18. From the foregoing, it is believed to be apparent that when the control lever "I6 rocked counterclockwise from the position shown .in Fig. 2, the spindle 2U will be moved to the right to cause the chuck jaws 28 to move,` to the right andopen and at the same time the resistorholding tool 38 will be moved to the right at the same time that the chuck jaws move to the right. Further movement may be imparted to the resistor holding tool 38 and its associated spindle 36 manually at the end of an operation to disengage the resistor IIl from the chuck jaws 2S.

The lathe frame I3 has ways 95, 9G and 91 formed on it, on which there is slidably mounted, as seen most clearly in Fig. 3, a tool carriage 93. The tool carriage 98 is provided with a depending portion 99, in which a suitably threaded device is positioned for engaging the feed screw I1 to move the tool carriage 98 longitudinally of the machine, that is, from left to right or vice versa (Figs. l and 2). The carriage 98 has a dove-tail I0!! formed upon it for engaging in a dove-tail slot I GI formed in a cross slide |02, The cross slide |02 is normally urged to the left (Fig. 3) by a compression spring |83 seated in a slot |24 formed in the dove-tail IBI) and engaging a downwardly extending portion |05 of the cross slide |32. In this manner, the cross slide |92 is urged toward the rear of the machine (to the left, Fig. 3) bythe spring ID3. However, the cross slide |92 is normally prevented from, moving beyond the position shown in Fig. 3 due to the engagement of a latch member |06 formed thereon with a latch |01 which is pivotally mounted on a pin |68 xed in a bracket I |39 suitably attached to the tool carriage 98. The left end (Fig. 3) of the latch I'I is pivotally connected to a core IIB of a solenoid III, also suitably mounted on the bracket |39 by means of'a block I l2. The cross slide |92 may be either locked in the position shown in Fig. 3 or may be pushed to the rear of the machine (the left, Fig. 3) to bring the downwardly extending portion |05 thereof into engagement with an abutment surface II3 formed on the tool carriage 98.

Pivoted on a pin IIB (Figs. 2 and fi), which extends downwardly from the bearing plate 1I. is a cam actuated lever II, which has a cam roller` |28 mounted'thereon in alignment with the cam 1B. The cam roller |20 is urged into engagement with the surface of the cam 18 by a contractile spring I2| attached to the right' end (Fig. 2) of thelever II and'to'a pin` |22 extending downwardly from the bearing plate 1I. The spring I2| normally tends to hold the lever I'IQ in the position shown in Fig. 2 to hold an actuator roller I 23 mounted on the left end of the lever H3 (Fig. 2) out of engagement with. an abutment |24 on the cross slide |2. The lever IIS in the position shown in Fig. 2 also carries a switch actuating screw I25 out of engagement with the actuating plunger |26 of a switch |21, which is also suspended from the bearing plate 1|. When the control lever 15 is rocked in a clockwiseY direction (Fig. 2), the cam 13 will rock the lever IIS counter-clockwise to close switch |21 and to cause the actuator roller |23 to push the cross slide |02 over to the position shown in Fig. 3, where the cross slide will be latched by the interengagement of the latch member |01 with latch |06. Simultaneously with the shifting of the cross slide |02, switch |21 will be closed to initiate operation of the motor 2|, as will be described more in detail in connection with the description of the operation of the apparatus.

Mounted on the cross slide |02 is a plate |33 havingformed integrally with it an upwardly extending support plate |34. The plate |34, in turn, supports a plate |35, which, as seen most clearly in Fig. 4, is pivoted on a mounting screw |36 and may be held in any one of a plurality of adjusted positions by a positioning uscrew |31, which is threaded into the plate |35 and extends through a slot |38 in the plate |34 (Fig. 4). By this construction, the angular position of the plate 35 with respect to the Iplate |34 may be adjusted. Mounted upon the plate |35 adjacent its upper end is a motor |39 for driving a pulley |46, which, in turn, drives a belt |4|, The belt |4| transmits motion to the pulley |42 mounted vupon the end of ashaft |43. The shaft |43 is journalled in a bearing |44 and has i'lxed to it a cutting wheel |45. The bearing |44 is formed integrally with a block |46, which is pivotally mounted on pivot pins |41 and |48 threaded into brackets |49 and |50, respectively, extending outwardly from the plate |35 (Figs. l and 4). The block |46 has a post |5| extending outwardly therefrom through which extends a threaded pin |52. The threaded pin 52 is fixed to the plate 35 and extends through an aperture |53 in the post |5|, Positioned around a reduced portion of the pin |52 is a compression spring |54, which engages an enlarged portion of the pin |52 and a washer |55, which bears against the post |5|. From the foregoing, it is believed to be apparent that the spring |54 normally tends to hold the post |5| in the position shown in Fig. 3, where it is in engagement with a knurled thumb nut |56 threaded onto the pin |52. The lower end of the block |46 is thus urged to the right (Fig. 3) to carry the cutting wheel |45 into engagement with a resistor I0, the block |46 being urged to move to the right (Fig. 3) by the compression spring |54 pressing against the post |5l. The plate |35 has an irregularly shaped housing |51 mounted upon it, in which the cutting wheel |45 is encased. The housing |51, as seen most clearly in Fig. 6, is provided with an aperture |58, through which the shaft |43 passes freely and it is also provided with an aperture |59 through which a portion of the cutting wheel |45 extends to engage the resistor I0. Coolant may be supplied to the housing |51 to cool the cutting'wheel |45 through a port |6| from a hose connection |62 extending to a suitable source of supply. The bottom of the housing |51 has an outlet port |63, through which the coolant may drain.

A bracket |10, as shown most clearly in Fig. 3, is mounted upon the bench or table l5 and carries three switches |1|, |12 and |13, having actuating rollers |14, and |16, respectively, positioned to be engaged by cam members |11, |18 and |19, respectively, suitably mounted upon the bracket |69 in position to engage the rollers |14, |15 and |16 at predetermined times in the operation of the machine and thereby Aclose their associated switches I 1|, |12 and |13. The switch |1I, when the machine is in normal inoperative position, is held closed by cam member |19. This switch, however, is a normally open switch and,

as soon as the cam member |19 moves away from 6 the roller |14, switch |1| will open. Switches 12 and |13 are adapted to be closed yat approximately the same time at the end of a cutting or grinding operation on a resistor I0. As shown most clearly in Fig. 8, closure of switch |13 will energize solenoid provided current has been supplied to the switch |13 from a transformer |80 due to the closure of a main control switch |8| connected toa suitable power source |82.

The switch |12 is a double-throw switch normally biased to close a circuit to a contact |83, but shiftable to transfer its movable contact |84 to engage a fixed contact |85 when the cam |18 engages actuating roller |15, The control circuit -for the apparatus includes a pair of relays |86 and |81, which, upon alternate energization, serve to connect power from the 'source |82 through switch |8| to opposite sides of the motor 2|, to thereby cause the motor to operate in opposite directions, as will be described more fully in connection with the following brief description of the operation of the apparatus.

In the operation of the apparatus, the lever 16 may be moved to the position indicated by the dot and dash lines |89 at the start ofthe operation of the apparatus to permit the loading of a, cylindrical member of ceramic material coated with a suitable conductor between the chucks 25 and 35. When the lever 16 is moved to the dot and dash line position |89, the camming block 19 will engage the end ofv the link 69 and will rock the bell crank 61 counter-clockwise, thereby, through link 68 and pin 52, to compress the spring 46 and retract the spindle 36 and resistorholding tool 33 to the right. Simultaneously with the movement of the resistor-holding tool 38 to the right, lever 11 will rnove link 80 (Fig. 2)"to the right to thus move chuck jaws 26 to the right and since these jaws are, as is usual in chucks of this type, resiliently urged to open, the chuck 25 will be moved to the right and will open its jaws, thus permitting an operator to insert a cylindrical member between the Chucks 25 and 35.

After a cylindrical member has been mountf .ed in the chucks 25 and 35, the lever 16 may be moved to assume the position indicated by the dotv and dash lines |90 toy initiate a groove-cutting operation on the member When the lever 16 is moved to the position indicated by dot and dash line |90, the spring 3| will be permitted to shift the chuck jaws 26 to the left to clamp onto the cylindrical member and the spring 49 will be permitted to push the resistor-holding tool 38 to the left (Fig. 6), thus to firmly grip the cylindrical member between the two chucks, As the lever 16 moves to the position indicated by line |96, switch actuating screw |25 will close switch |21 and actuator roller |23 will force cross slide |92 to the position shown in Fig. 3, where it will be latche'd by the interaction of the latch member |06 and latch |01. It will be understood that prior to manipulation of the lever 16, switch 8| has been closed to supply power from the source |82 to the transformer |80 and thence to the motor |39, which is permanently connected to the secondary of the transformer |80. Thus the cutting wheel |45 will be continuously driven whenk power is supplied to operate the other portions of the apparatus. The switchv |21, having been closed by the rocking of lever ||9 counterclockwise by the cam 18, will connect one of the leads from the switch |8| to the winding of relay l86, the other side of the Winding of which is permanently connected to one of the lea'ds leading to switch IBI. Thus, the relay |86 will be en- :ergized :and will, through 'its contacts, 'supply power :to drive the motor2| in a direction to cause the tool ycarriage 98 to move to the right, 'as viewed 'in Fig. 4, and to the left, as viewed in Figs. 1 and 2. As soon as the tool carriage starts to move, the spring |54 urging the block |46 to rock counterclockwisa as viewed in Fig. 3, will resiliently urge the cutting wheel |45 against the cylindrical member and the gearing in the Ygear box I8 will drive the spindle 20, thereby to .rotate the cylindrical member at a relatively slow rate of speed while the tool carriage moves the cutting wheel longitudinally of the cylindrical member thus to cut a spiral groove in the fcylindrical member |"I and form the resistor l0. .As soon as the cross slide m2 has been moved lto the position shown in Fig. 3 and switch |21 has been momentarily closed, the lever 16 may be released and power will then be supplied to '-hol'd relay |86 energized over llocking Contact bar |91, through contacts |83 and |84 of switch |12. Thus the toolcarriage 98 will continue to move to the left V(Figs. 1 and 2; the right, Fig. 4) until cam members |18 and |19 engage their associated `actuating rollers |15 and |16 to close `switches l1? and |13. The two cam members |18 and |19 may be so arranged that they will simultaneously eiect the closure of switches |12 or i13or preferably switch |13 may be closed just a very short 'time before switch |12. When 'switch |13 closes, power will be supplied to energize Ythe solenoid lll, thus releasing latch |01 from latch member andpermitting spring |03 'to move the cross slide |02 to the left from the position shown in Fig. 3. VAs soon as switch '|12 operates, the locking circuit for relay |36 will -yb'e broken `at switch V|12 and a circuit will be completed momentarily to energize relay |81. When relay |81 is momentarily energized, it will be locked up through locking contact bar |92 and the fnow closed switch |1|. YEnergization of relay 181 will reverse the connections to the motor 2| and'cause it to drive the spindle 2B and feed screw i1 in the opposite direction to return the tool carriage YS18 to its right-hand position, as viewed in Figs. 1 and 2, or its left-hand position, as viewed in Fig. 4. The motor is a two-speed Ymotor and the carriage is returned at a speed double that of the 'forward or cutting movement. The 'travel of the tool -carriage back to normal position will continue until cam member |11 opens switch Ill, which breaks the locking circuit for relay itl and `restores the circuit to normal.

'Ii it be assumedthat the plate |35 has been 'adjusted to proper `angular relation with respect "to the plate |34 and locked in that position prior 'to the initiation of the operation of cutting a groove in a cylindrical member ll, the width of 'the groove formed and its length may thus be controlled'with a high degree of accuracy, where- `by the resistance of the resistor lil may be conrolled. After the resistor has been formed by 'cutting the groove |2 in it, the lever 1S may be moved to the position'indicated by dot and dash lines at 89 and the completed resistor may be removed 'from the chucks 25 and 35, which have now been shifted to the right (Fig. 2) due to the operation of the lever 16, by the operator manually moving the spindle 35 to the right, as seen fin Fig. 6. Y

'What is claimed is:

1. An article-forming apparatus comprising means for rotating a blank, cutting means engageable with the blank, lever means for moving the vcutting means ,into engagement wit-hthe blank, a cam for 'actuating :said Ylever means, means for advancing the cutting means longitudinally of the blank during 'the rotation 'of the blank, means actuated-by said lever 'means 'for initiating operation of said advancing means, means operable for reversing the operation of lthe advancing means, and means movable with the cutting means during its advance for rendering the operation reversing means operative.

2. An article-forming apparatus comprising means for rotating a blank 'including chucks for holding the blank, cutting means engageable with the blank, means for advancing the cutting means longitudinally of the vblank during the rotation lof the blank, means for initiating operation 'of said advancing means, including lever means for shifting isaid cutting means into engagement with the blank, means operable for reversing the operation of the advancing means, means movable with the cutting means during its longitudinal advance for rendering the operation reversing means operative, cam means for actuating said lever means, a manually controlled shaft `for supporting and operating said cam means, a second cam means on said shaft, and linkage means operated by said second cam means and 'chucks for operating said chucks.

3. An article-forming apparatus comprising means for rotating a blank, a cutting wheel engageable with the blank, a support for said cuttingwheel, a lever for shifting said support to engage the cutting wheel with the blank, a switch operable by said lever for initiating operation 'of fthe rotating means, `a carriage for carrying said :support longitudinally of the blank, a reversible drive means for said carriage and said rotating means, switch actuators carried by said carriage, a control circuit for said reversible drive means, `:andswitches positioned for actuation by 'said 'switch actuators and operable upon initiation of operation of the rotating means for sequentially effecting the disengagement of the cutting wheel from the blank and causing the control circuit to `reverse lthe operation of the drive means.

4. An article-forming apparatus comprising means for rotating a blank, a cutting wheel en- 'gageable with the blank, a support for said cutting wheel, a lever for shifting said support to engage the cutting wheel with the blank, a'latch -for holding said support in position to hold the cutting wheel lin engagement with the blank, a solenoid for releasing said latch, means for advancing the support longitudinally of the blank, `means common to vthe rotating and advancing means for actuating them, means operable by said lever for initiating operation of the means common to the advancing and rotating means, and means actuated by the support at the end of its advance for energizing said solenoid.

5. An article-forming apparatus comprising means 'for rotating a blank, a `cutting wheel engageable with the blank, a support for said cutting wheel, a lever for shifting said support to engage the cutting wheel with the blank, a latch for holding said support in position to hold the cutting wheel in Vengagerlrlent with the blank, a solenoid for releasing said latch, means for advancing the support longitudinally of the blank, means common to the rotating and advancing means for actuating them, means operable by said lever for initiating operation of the means common to the advancing and rotating means, means-actuated by the support at the end of its 4advance for energizing said solenoid, and a sec for holding said support in position to hold the cutting wheel in engagement with the blank, a solenoid for releasing said latch, means for advancing the support longitudinally of the blank, means common to the rotating and advancing means for actuating them, means operable by said lever for initiating operation of the means common to the advancing and rotating means, means actuated by the support at the end of its advance for energizing said solenoid, a second means actuated by the support at the end of its advance for reversing the operation of the means common to the advancing and rotating means for returning the support to position to have opera'- tion of the advancing and rotating means initiated, and a switch operable by the support upon its return to restore operability to the initiating means.

7. An article forming apparatus comprising chucks for supporting a blank, means for rotating said chucks to rotate the blank, cutting means engageable with the blank, lever means for moving the cutting means into engagement with a blank held by the chucks, means actuated by said lever means for operating said chucks, a carrier for supporting the cutting means for movement longitudinally of the blank during rotation of the blank, drive means for advancing and retracting the carrier means and for the means for rotating the chucks, means on said lever means for initiating operation of said driving means, a circuit operable under control of said means for initiating operation of the driving means, a plurality of switch actuators carried by the carrier means, a switch in said circuit operable by one of said actuators to prepare a circuit for reversing the direction of operation of the driving means when said carrier is in normal inoperative position, a second switch in said circuit for actuation by one of said actuators to cause a reversal of the driving means when the carrier means reaches a predetermined position, v

and a third switch for actuation by one of said 10 actuators when the carrier reaches its eXtreme advanced position for effecting the disengagement of the cutting means from the blank.

8. An article forming apparatus comprising means for holding and rotatably supporting an article, a cutting tool, means for supporting said cutting tool for relative movement longitudinally and toward and away from said article, an operating lever, means responsive to an initial movement of said operating lever for actuating said article holding means, means responsive to a further movement of said lever for relatively moving said cutting tool toward said article in said article support, means for relatively moving said cutting tool longitudinally 0f said article, means for initiating said longitudinal movement in response to said further movement of said operating lever, and means for relatively withdrawing said cutting tool from said article and restoring it to starting position after a predetermined 1ongitudinal traverse.

9. An article forming apparatus comprising means for rotatably supporting an article, a cutting tool, means for supporting said tool for movement transversely and toward and away from said article, a reversible motor for moving said tool longitudinally of the article, a control circuit for said motor, a switch in said control circuit for initiating the energization of said motor, a holding circuit for maintaining said energization after said switch is released, means in said control circuit for reversing said motor after a predetermined travel, and means for stopping said motor when said cutting tool is restored to its initial position.

10. An article forming apparatus comprising means for rotating a blank, a cutting tool, a support for said cutting tool, means for shifting said support to engage the cutting tool with the blank, means operable to initiate operation of said rotating means, a carriage for carrying said support longitudinally of the blank, a reversible drive means for said carriage and said rotating means, switch actuators carried by said carriage, a control circuit for said reversible drive means, and switches positioned for actuation by said switch actuators and operable upon initiation of operation of the rotating means for sequentially effecting the disengagement of the cutting wheel from the blank and causing the control circuit to reverse the operation of the drive means. l

ELMER E. BARKSTROM. LORRIS WILLIAMS. 

